Previous to the rewrite, one could select the graphical representation of a partition in order to edit said partition. Now when one tries this, a message box pops saying that you must select a partition to edit.
Just tested this and it seems that this went away. Feel free to reopen this issue if it pops up again.
It is still a problem, at least with empty space. Clicking on space and hitting edit generates a message that a device has to be selected first. Same thing with double clicking on space.
This will be fixed in the next build of anaconda. Thanks for the bug report.